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I have googled it all over and tried all the solutions answered to the similar questions such as:

  1. Settings -> Additional Settings -> Developer options -> Turn off Miui Optimizations -> Restart
  2. Turn on mobile data, not wifi and don't use any VPN
  3. Security -> Permissions -> Gear Icon at top right corner -> Turn On "Install via USB"
  4. Settings -> Additional Settings -> Developer options -> Turn On/Off "USB Debugging" -> Turn On "Install vis USB"

But nothing works. Can someone suggest any solution?

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你试过这个吗？关闭wifi并打开移动数据并启用通过USB安装

于 2018-08-15T08:48:11.530 回答